Sofa



FIG. 1 is a perspective view of a sofa showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof; and,

FIG. 4 is a right side view thereof, the opposite side being a mirror image of the side shown.

The rear of the sofa forms no part of the claimed design. FIG. 1 has been shown on a slightly reduced scale with respect to FIGS. 2 through 4. 

The ornamental design for sofa, as shown and described. 